Floor surfacing machine



Filed May 14, 1937 4 Sheets-Sheet 1 Inventor 'eoaye A- .Bermww A iiorpeys Nov. 23, 1937. a. A. BERMAN 2,099,959

FLOOR SURFACING MACHINE Filed May 14, 1937 4 Sheets-Sheet 2 Inventor ear-7e *4. Berman A itorneys Nov. 23, 1937. G BERMAN 2,099,969

FLOOR SURFAC ING MACHINE F iled May 14, 1937 4Sheets-Sheet 3 m R egkje A. Berma vz/ Afiorneys Nov. 23, 1937. a. A. BERMAN FLOOR SURFACING MACHINE Filed May 14, 1937 4 Sheets-Sheet 4 Inventor @620 By Q5, 5

Attorneys Patented Nov. 23, 1937 PATENT OFFICE FLOOR SURFACING MACHINE George A. Berman, Lawrence, Mass, assignor of one-half to Oswald L. Rugaard, Lawrence,

Mass.

Application May 14, 1937, Serial No. 142,710

6 Claims.

This invention relates to aportable, one-man operated, floor sanding machine of the rotary, single-drum type, characterized by appreciable structural refinements and complemental im- I provements contributing their proportionate share in the development of a construction calculated to more aptly fulfill the needs of the manufacturer and trade in general.

\ Needless to say, I am sufficiently conversant 10 with the prior field of invention to appreciate that it is highly and carefully developed. Therefore, my primary aim is to provide a mechanically correct, well balanced structure possessed of. consoli'rlated features of merit unquestionably recog- 18 nizable as improvements suificient to provide a thoroughly practical, up-to-date and reliable construction.

That phase of the invention considered to be worthy of primary mention is a multiple-part unit, in the nature of an attachment for the mobile motor and drum equipped chassis, said attachment being distinctive and characteristic in that it provides a novel assembly of readily ad- 'justable and interchangeable replacement fea- Stated otherwise, in reducing to practice the preferred embodiment of the invention, I have stressed that part of the general assembly comprising a detachable and adjustable mount, this g g carrying the dust fan means, the dust bag supporting and exhaust pipe, and the adjustable twin-type handle. l

A further feature of novelty is predicated on the incorporation in the casing-type chassis or frame of a dust shield or guard coacting with theadjacentrotary drum, whereby to render the machine substantially dust proof.

Of equal importance is the sanding drum itself, this being of the slotted cylinder type having 41 spaced paralleliinternal sandpaper clamping rods,

one of said: rods being provided with stop and signalling means to disclose when the rods are wide open to facilitate inserting and removing the coacting ends of the wrap-around sandpaper.

45 Other features and advantages will become more readily apparent from the following description and drawings.

In the drawings, wherein like numerals are employed to designate like parts throughout the .5 views Figure 1. is a side elevational view showing a machine embodying the general principles of the inventive conception and characterized by the specific improvements to be hereinafter particu- .:5.5 larly described.

Figure 2 is a top plan view of Figure 1, with the handles, exhaust pipe, and dust bag removed for clearness of illustration.

Figure Me a view like Figure 1, with the adapter plate of the multiple-part attachment removed to disclosev the accommodation slots in the chassis.

Figure 4 is a side elevational View of the allimportant unit or assembly constituting the aforementioned attachment.

Figure 5 is a detail top plan view of the adapter plate with certain of the accessories removed for clearn'ess of disclosure.

Figure 6 is a bottom plan view of the arrangement depicted in Figure 5.

Figures 7 and 8 are sectional views on the planes of the lines ll and 8-8, respectively, of Figure 5, the exhaust pipe and one of the handles being shown in place in Figure '7.

Figure 9 is a plan view of the brace clampor fixture providing a stabilizing union or connection 2 between the duplex or twin handle and the exhaust pipe.

Figure 10 is a central longitudinal section on the line |;ll-|U of Figure 9.

Figure 11 is a View in elevation of the dual or twin-type handle means.

Figure 12 is an enlarged transverse sectional view through thesanding drum detailing the im proved sandpaper clamping and retaining means.

Figure 13 is a fragmentary view based on Figure 12, the sandpaper being removed, and the members of the stop or check signalling means being in contact.

Figure 14 is a fragmentary view in section and elevation of one end of the drum showing the single wrench or tool grip and the check finger.

Attention may be logically called first to Figure 1 of the drawings showing the complete or general arrangement forming the whole floor sanding machine. 1 The chassis or frame is denoted by the numeral l5 this being of the customary longitudinally elongatedrectangular type, and including longitudinal side walls l6 depending from the top plate I! and joined together at their rear ends by a transverse connecting web or rear wall l8. At the front is a suitable hinged shield IQ for the rotary sanding drum 2D. The drum is journaled in appropriate bearings and self driven from the prime mover or electric motor 2| supported on the top plate H. The 5 transporting and fulcrum rollers 22 are indicated as being disposed intermediate the ends ofthe chassis or frame. These may be either on the inside or outside, whichever is desired.

Disposed transversely between the side plates l6 and extending from the top plate down to a point terminating in spaced relation to the floor is a partition 22 forming an inner dust guard. This feature, together with the shield l9, provides an effective inclosure for the sanding drum. Using a curved plate of the type seen in Figure 2, and providing it with a central discharge nozzle 23, provides an inclosure or housing around the drum making the frontal portion of the machine substantially dust proof. Incidentally, the numeral 24 designates a dust conducting hose or conduit connectable at its rear end to the intake nipple 25 on the fan housing or casing 26. This is of the customary suction and blower type, the rotary fan being indicated at 21. The fan is driven by a pulley which is in turn operated from a belt 28 connected with the motor 2!, as seen in Figure 1.

As seen in Figure 3, the rear central portion of the top plate is provided with what may be called an accommodation notch or slot 29 to accommodate the attachment unit or assembly seen in Figure 4 and denoted as a unitary assemblage by the numeral 30. This feature 30 is characterized by a substantially rectangular adapter or attaching plate 3| which covers the opening or slot 29 and is detachable and adjustably mounted in place. It will be noticed, for example, in Figure 5, that elongated slots 32 are formed at the corners to accommodate clamping bolts 33, as brought out to advantage in Figure 2. By having the plate 3| bodily adjustable in the slot 29, it is possible to shift the plate rearwardly and to thereby take up slack in the dust fan belt 28. This is one feature of the unit 36. Secondly, it is formed with an integral upstanding socket 34 having bolted clamping lugs 35 to detachably accommodate the upstanding exhaust pipe 36. The exhaust pipe is provided at its upper end with the customary gooseneck 31 from which the dust collecting bag 38 is detachably suspended or hung. A further feature of the assemblage is the depending blocklike enlargement on the under rear end of the adapter plate 3|. This particular part is differentiated by the numeral 39 and is shown to advantage in Figure 6. That is to say, it is bored as at 40 to accommodate the lower ends of the handle rods 4|. I provide two rods and these are disposed in spaced parallelism and are of duplicate construction. At their upper ends they carry suitable hand-grips 42 and a motor controlled switch A. In casting the part 39, it is formed with a longitudinal slit 43 providing resilient clamping means rendered effective by the clamping bolts 44. This makes it possible to easily insert the handle rods 4| and to maintain them in adjusted position. It also makes it possible to raise and lower the hand-grips to suit' the stature or height of the operator. This feature 39 may be conveniently referred to as a slit resilient, bolt-equipped clamping block for the handle bars or rods.

I next call attention to the numeral 45, this indicating a clamping fixture providing a well defined connection between the exhaust tube or pipe 36 and the handle rods 4|. Here, again, we are concerned with a suitably shaped block of metal 46 interposed between said parts 36 and 4|. At one end is a split clamping band or ring 41 having a clamping bolt at 48. At the opposite end is a detachable clamping head 49 having notches coacting with similar notches in the block 46 to provide passages for the handle rods 4 I. The numeral 50 designates the retaining bolts and thus permits said block 46 to be individually clamped at oppositeends to the exhaust pipe 36 and rods 4|. Obviously, this provides a dependable stabilizing feature.

Referring again to the exhaust fan shown in Figure '7, it is to be observed that the casing is provided with an attaching flange 5| conveniently conn-ectable with the under central side of the adapter plate 3|. This is removably bolted in place as at 52. The peripheral exhaust registers with the socket 34 to provide the desired communicating connection between the exhaust pipe and said fan casing.

In this multiple-part unit 30 it is evident that all of the parts are readily separable and replaceable. This makes for convenience in manufacture and repair. It provides for consolidation enabling the various parts to be assembled on the plate 3|, after which it may be conveniently bolted on the chassis.

Attention is now called to the phase of the invention disclosed in Figures l2, l3 and 14. As seen in Figure 13, the hollow cylindrical drum is provided with an entrance slot 53 to accommodate the inturned ends 54a of the abrasive paper 54. This method of tucking in the ends of the paper and clamping them between rods 55 and 56 is not broadly new. In the present arrangement, however, it will be observed that the knurled rod 55 is rigidly keyed in the heads 51 of the drum. This makes the remaining rod 56 wrench controlled. That is to say, it becomes necessary to operate only one of the two rods in effecting the clamping action seen in Figure 12 of the drawings. The knurled rod 56 has a flattened side, as at 58, which makes of said part 56 a clamping cam. When it presses the paperends 54a against the rod 55, the paper is securely fastened in place. It is sometimes difficult to determine when the cam is open, that is, in alignment with the slot 56. To overcome this, I provide a check finger 59, this being secured to the oscillatory cam 56 and engageable with a stop lug 66 on the drum head bearing 6|. By applying a wrench or equivalent tool to the toolend 62 seen in Figure l and projecting beyond the head of the drum, it is convenient to turn this to either open or close the cam. When the cam is open, as seen in Figure 13, the check fin ger 59 strikes the stop or abutment lug 60, thus limiting the angular rotation of. said cam and opening it to either facilitate insertion or removal of the paper ends 54. It follows, therefore, that the features 59 and 60 form coacting stop elements and provide a metallic clicking noise which is in effect a signal to show when the cam is open to facilitate exchange of abrasive paper.

It is thought that the description taken in connection with the drawings Will enable a clear understanding of the invention to be had. Therefore, a more lengthy description is thought unnecessary.

While the preferred embodiment of the invention has been shown and described, it is to be understood that minor changes coming within the field of invention claimed may be resorted to if desired.

I claim:

1. In a floor sanding machine of the class described, a mobile chassis, a prime mover supported on said chassis, a sanding drum mounted for rotation on the chassis, an operating connection between the prime mover and sanding drum, said chassis including a bed plate, and a mount detachably and adjustably secured to said bed plate, said mount including an adapter plate, handle means detachably and adjustably connected with said adapter plate, an exhaust pipe detachably connected with said adapter plate, and a dust fan unit detachably secured to the under side of said adapter plate and suspended within the confines of adjacent surrounding portions of said chassis.

2. As a component part of a floor sanding machine of the class described, a mount in the form of a bodily applicable and detachable unit, said unit including an adapter plate having an apertured socket-equipped portion, an exhaust pipe mounted in said socket and adapted to support a dust collecting bag, a dust fan unit detachably bolted to the under side of said adapter plate and registerable with said apertured portion and socket, a pair of complemental handle rods, and means on said adapter plate for adjustably and detachably connecting corresponding lower ends of said rods to said adapter plate.

3. As a component part of a floor sanding machine of the class described, a mount in the form of a bodily applicable and detachable unit, said unit including an adapter plate having an apertured socket-equipped portion, an exhaust pipe mounted in said socket and adapted to support a dust collecting bag, a dust fan unit detachably bolted to the under side of said adapter plate and registerable with said apertured portion and socket, a pair of complemental handle rods, means on said adapter plate for adjustab-ly and detachably connecting corresponding lower ends of said rods to said adapter plate, together with a clamping and stabilizing fixture comprising a connective block interposed between the exhaust pipe and handle rods and having clamping means at opposite ends embracing the handle rods and exhaust pipe.

4. In a sanding drum machine of the class described, a chassis including a casing having a top plate, said top plate being provided at its central rear end portion with an accommodation slot, a mount of a bodily detachable type including an adapter plate, said adapter plate resting on said notched top plate of the casing,

dust collecting bag means mounted on said adapter plate, handle units also mounted on said adapter plate, and a dust fan unit bolted to the under side of the adapter plate and suspended in said casing, and bolt and slot means between the adapter plate and top plate of the casing permitting longitudinal shifting of the adapter plate, a motor on said top plate, and a belt connected with said motor and with said fan unit, whereby shifting of said adapter plate serves to tighten the belt.

5. As a component part of a floor surfacing machine of the class described, a bodily applicable and detachable carrier unit, said unit embodying an adapter plate, an exhaust pipe detachably and adjustably connected to and rising from said plate, the upper end of said exhaust pipe being adapted to support a dust-collecting bag, a dust fan unit detachably bolted to and hung from the under side of said adapter plate, and handle means attached to and rising from said adapter plate and having its major portion parallel to the exhaust pipe, and a stabilizing brace adjoining the handle means and exhaust pipe.

6. In a sanding drum machine of the class described, a chassis including a casing having a top plate, said top plate being provided in a predetermined area with an accommodation aperture, a mount of a quick attachable bodily removable type including an adapter plate, said adapter plate resting on the top plate and covering said aperture, and being adjustably maintained in place, a dust collecting and bagging means supported on said adapter plate, a handle means also supported on said adapter plate, a dust fan unit supported from the under side of said adapter plate and suspended within the confines of said casing, said fan unit including a rotary pulley equipped fan, a motor on said top plate including a pulley, and a driving belt connection between the respective pulleys, whereby said adjustable adapter plate may be utilized when bodily shifted in relation to the top plate, to tighten and loosen the belt.

GEORGE A. BERMAN. 

